Effect of an oscillating Gaussian obstacle in a Dipolar Bose-Einstein condensate

Abstract

We study the dynamics of vortex dipoles in erbium (${}^{168}$Er) and dysprosium (${}^{164}$Dy) dipolar Bose-Einstein condensates (BECs) by applying an oscillating blue-detuned laser (Gaussian obstacle). For observing vortex dipoles, we solve a nonlocal Gross-Pitaevskii (GP) equation in quasi two-dimensions in real-time. We calculate the critical velocity for the nucleation of vortex dipoles in dipolar BECs with respect to dipolar interaction strengths. We also show the dynamics of the group of vortex dipoles and rarefaction pulses in dipolar BECs. In the dipolar BECs with Gaussian obstacle, we observe rarefaction pulses due to the interaction of dynamically migrating vortex dipoles.

arXiv commentarXiv admin note: text overlap with arXiv:1101.2052 by other authors

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• Rayleigh-Taylor, Kelvin-Helmholtz and immiscible to miscible quenching instabilities in binary Bose-Einstein condensates
• Characterization of the energy level-structure of a trapped dipolar Bose gas via mean-field parametric resonances